ABS/TCS module

**seanlong** · 04-18-2007, 07:04 PM

Hello,

After getting my 1998 Firebird TA washed, my TCS light came on and stayed on. Dealer pulled code 239 and following the manual troubleshooting tree, found a short to ground in the ABS/TCS module (the one with the long acronym name that I can't remember) and says it'll cost $1150 to replace the module.

Any idea where I can find one cheaper than that? Think gmpartsdirect will have one?

Thanks in advance.

**Steve Crowe** · 04-21-2007, 08:36 AM

Don't be so quick to replace it, sounds like the same deal as in the last post I replied to. The wheel speed sensor connectors are notorious for failing after getting wet and could easily cause a false report of a bad ABS module.

Unplug them all, clean all the electrical contacts with contact cleaner then coat with a bit of silicone grease.

**seanlong** · 08-11-2007, 05:19 PM

follow-up:

The dealer ran their troubleshooting tree and the TCS module has a short to ground in it. Unfortunately gmpartsdirect.com says that the module is on backorder from GM and there is no delivery date, so I might not be able to get a new module from anyone.

Bummer.

**9t8z28** · 08-11-2007, 05:59 PM

Hmmm! I have the same issue. I will try that. I also am wondering if the speed sensors for a 97 are the same for a 98. I was gonna try and so a swap to isolate the problem.

What kind of voltage will the speed sensor send?

**seanlong** · 08-11-2007, 06:14 PM

I dunno what voltage it sends. The service manual troubleshooting guide says to check for a circuit between a certain pin and ground. If there is a circuit there, then the module is shorted out internally and must be replaced. That's what they found with mine.